W3Fools is on a crusade against what they alleged to be bad docs and poor learning material in W3Schools which, of course, is not endorsed by W3C in any way.
Some sites with good documentation for HTML, CSS, JS and others suggested by W3Fools are:
- http://www.w3.org/wiki/HTML
- http://htmldog.com/
- http://dev.opera.com/articles/view/1-introduction-to-the-web-standards-cur/#toc
- http://code.google.com/intl/es-419/edu/submissions/html-css-javascript/
- https://developer.mozilla.org/en-US/docs
These are some great resources with up to date references.
